this is LEAF:
https://github.com/eycorsican/leaf
Leaf is a proxy framework developed with Rust.
With leaf you will be able to build VPN proxy library for Android and IOS.
check it :
https://github.com/eycorsican/leaf/blob/master/Makefile
this is an example repo:
We need to build android library with LEAF:
Here is an example:
https://github.com/chekun/aleaf